Method of replacing broken dental facings.



J. K. BISHOP.

METHOD OF REPLACING BROKEN DENTAL FACINGS.

APPLICATION man 001.14. 1914.

1,147,597. Patented July 20,1915.

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METHOD or REPLACING Bnofrnn DENTAL rAoInGs.

To all whom (it may-concern:

Be it known that I, JOHN K. Brsl-ror, a citizen of the United States, residing at Roswell, in. the county of Ghaves and Stateof. New Mexico, have invented certain new and useful Improvements in Methods of Replacing Broken Dental Facings, of which the following is a specification.

This invention relates to artificial teeth and more particularly to crown and bridge construction. v I

One object of the invention is to provide a new and improved method wherein a crown or bridge having a worn or defaced face or facings, may be re faced and restored to its original perfect condition.

Another object of this invention resides in providing a method wherein the cost usually associated with work of this character is materially reduced.

Another and still further object is to enable an old and worn crown or bridge to be reconstructed in a: satisfactory manner, without necessitating removal of the same from the mouth. 7

Another object is to provide the. crown or bridge unde'rreconstruction with a facing which may be readily replaced when desirable. y 7

Another object resides in providing an extremely eflicient and'durable connection between the crown and its facing.

The final object of'this improved method is to secure an extremely neat, strong and simple 'joint between the back and intermediate member used in connecting the face to the crown back.

With these and other objects in view my invention consists in certain novel features of construction, combination and arrangement of parts as will forth and claimed.

None of the many methods used .in the past for replacing broken facings has been satisfactory, either from the standpoint of durability or cleanliness, making their re moval and replacement by new work neces sary. Of course in this connection, 1t isito.

be understood that'I refer to such crowns and bridges as are not supplied with removable facings, in other words, an ordinary crown or bridge. Now, as this is a very trying operation, for both the dentist and his patient, and often results in in ury to, and sometimes loss of, the root or roots used as anchorages, as well as costly to construct a be particularly set sp fi ofteeers am- "Patented July 20, 1915.

- Application filed October 14, 1914.. Serial No; 866,615.

new one, it islperfectly obvious thatthe' practice of today is quite ineflicientand' it i is to overcome this deficiency'thatI propose to provide a method whereinan. old crown or brldge maybe readily refaced. and re- .stored to perfect condition without being. removed fromits seat, whichwill' thus per-. mit the backing of the old crown to be utilized and mean quitea saving intime and material and hence a reduction 1n the cost of providing a new crown or bridge as the case might be.

In theaccompanying drawings: Figure 1 is an enlarged side elevation .of an old crown, the facing of which is partly damaged ;"Fig. 2 is asimilarview after the facing has been removed; F ig. 3 is a similar view illustrat ing the back of the old crown with its lower edge beveled; Fig. 4 is a side elevation showing the old backing with casting wax thereon; Fig. 5is a side elevationof the auxiliary or intermediate backing; Fig. 6 is a similar view illustrating the backing as formed with the tip; Fig. 7 is aside elevation of the crown backing illustrating. the

intermediate back and "its tip disposed upon the same; Fig.8 is a side elevationillustrat- I ing the intermediate backing and facing as applied to the crown; Fig. 9 is a'front elevation of the old backing-with the auxiliary backing secured thereto; Fig. 10 is a trans-- verse vertical section taken on the line 1010 of Fig.9 with the removable facing in position; .Fig. ll is a horizontal section taken on theline 1111 of Fig. 9;Fig. 12 is a perspective view of the intermediate backing andv its tip; and Fig, 13 is a rear elevation of the old crown backing showing the disposition of the tip on the auxiliary back. i In the illustrated embodiment there is shown an intermediateor auxiliary backing '1 formed Ofany suitable metal andghaving a laterally offset lStllCl 2contiguous to its upper end. Thisstud '2. is adapted to project into a longitudinally extendingslot 3 formed in the lingual" orpalatalisurface of a facing 4:. It ishere to be noted, however,

that I donot claim any novelty in connection with the auxiliary backing 1 or the facing 4, but simply use the same as they are very convenient in carrying'into effect the method hereinafter to be set forth; but any replaceable facing having an individu back may be used with this method.

Coming now more particularly to the man ner of reconstructing a crown or bridge as hereinafter set forth, it will be seen that the same is as follows: If for example the facing of the old crown should become nicked or chipped as shown in Fig. 1, instead of removing the same as would be necessary under ordinary conditions, the operator by means of the dental engine simply grinds away the damaged facing from its backing 5 until the latter appears as in Fig. 2. Having removed the facing the lower edge of the backing 5 is then beveled and the labial surface of said backing smoothed at the completion of which operation the old crown backing will appear as in Fig. 3; the old crown being removed and the backing properly shaped the latter is now in condition to receive the auxiliary or intermediate backing 1. However, in order that the operator may shape the auxiliary backing to enable the latter to properly fit the old backing, casting wax is applied to the palatal or lingual surface and shaped as in Fig. 4:. From the cast made by the wax the tip is formed on intermediate backing and any change in length or position of facing may at this time be made. The operator next applies cement to the back of the intermediate backing as well as to the beveled surface of the tip 8 and then applies said back and tip to the old backing as clearly shown in Fig. 7. When the auxiliary backing is seated upon the labial surface of the old backing, its tip 8 will underlie the beveled surface of the back 5 and in addition to forming an extremely tight joint also fills out the back 5 and compensates for the portion cut away, giving strength to replaced portion. The auxiliary backing 1 being in place, it is then formed with one or more countersunk openings 6 which register with similar openings formed in the back 5 and through the openings thus formed are passed the rivets 7 which securely retain the auxiliary backing in place. In this connection it is to be understood that screws may be used if necessary and if they are employed then the openings formed in the back 5 are threaded so that the screws may be retained in place. The auxiliary backing 1 now being firmly secured in place upon the old backing 5 the facingd having suitable cement applied to its palatal surface, is applied to said auxiliary backin the stud 2 on the latter projecting into the longitudinal slot 3 formed in the facing After the cement has hardened the facing will be firmly and securely attached to the auxiliary backing and the old crown will have thus been reconstructed and restored to perfect condition.

In the foregoing I have stated my method in conjunction with a crown but it is to be here understood that the same steps would be required in-the replacing of a bridge and consequently the description of the method in connection with the latter has been thought unnecessary.

It is now apparent by reason of what has been said with respect to my improved method, that should thefacing of an old crown become damaged or defaced, and it is here to be noted that I refer to such crowns as are not equipped with a replac able facing, such facing may be removed and the old crown reconstructed and restored to its original perfect condition without necessitating the removal of the old crown from its seat. llhis saves the patient not only the cost of a new backing because,

' it is seen, by my improved method the old backing may be reutilized, but it also eliminates to a more or less greater extent, the annoyance and discomfort usually associated with the removal of a crown from its seat.

Although in the foregoing 1 have set forth certain elements as best adapted to carry out the functions allotted to them, nevertheless it will be understood that various changes of form, substance, etc., may be referred to Within the scope of the appended claims without departing from or sacrificing any of the principles of this invention.

In connection with the above, it is to be noted that my improved method may be ad vantageously used for anchoring a new bridge at each end or at one end as the case may be, to work fixed in the mouth, in other words, to an old crown just as it would be used in refacing the latter.

I claim as my invention:

1. The herein described method for replacing dental facings consisting in removing the old facing and shaping the backing of the latter, affixing a suitably contoured auxiliary backing thereto and applying a new facing tosaid backing, substantially as and for the purpose set forth.

2. The herein described method for replacing dental facings consisting in removing the old facing, shaping the cutting edge of the backing for said facing, cementing a suitably contoured auxiliary backing to said first mentioned backing, strengthening the connection between said backing by fasten ing the latter with suitable fastening members and applying a new replaceable facing to said auxiliary backing substantially as and for the purpose set forth.

JOHN K. BISHOP.

itnesses J. M. HERVEY, LUCY L. downs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G. 

